Improvement in countersinks



urna sine eine offre.

FRANK H. PALMER, OF FOXCROFT, MAINE.

Letters Patent No. 112,176, dated February 28, 1871.

IMPROVEMENT IN COUNTERSINKS.

The Schedule refuted fa in these Letters Patent and making peutv of the same.

My invention relates to devices for or modes oi' fastening a reame-r and conntersink to a boring-bit, so that either may be readily used without the re moval of the other from the borer.

I will iirst describe my invention in connection with all that is necessary to a full understanding thereof, and then clearly point it out in the claim.

Figure l is an elevation of a bit, and perspective view of my improved attachments applied to it;

Figure 2 is a side view of my improved countersink;

Figure 3 is a side view of the same, taken perpendicular to that of iig. 2;

Figure 4 is a side view of the reamer;

Figure 5 is another side View of the same; and

Figure 55 is a horizontal section of 4.

Similar letters ci' reference indicate corresponding 'goal-ts.

I propose to attach a conntersinhing tool, A, a roaming tool, B, to the shank of a boring tool, if), by clamping them thereon, in a manner to admit or" adjusting them along the tool, also with reference to each other, and to hold them so that, when the tool has entered the wood or other substance bored the required distance, the holes will be countersunk or reained, the case may be; and for this purpose I provide the tools A. .E3 with a slight groove along the face, which lits against the shank of the tool C, and one of' them I provide with the bridge D, and the other with the lng E, the saidV bridge having a slotted l or elongated hole, Il, and the lng E, a large hole in the longitudinal direction of the tool Vl5; also the screw-threaded shank H, which passes through the hole F, when the two tools are placed against the shank of the tool C, on opposite sides, the said tool passing through the hole G and the lng E, being placed in the space between the ends and the top of `the bridge D.

A thumb-nut, I, is then secured on the stud or shank H, and clamps the whole together, confining the tools to the shank of tool C, at any required point along the same, according tothe depth oi the hole to be bored and counter-sunk or reamed.

The spa-ee at K under the bridge D, which is pro vided for the reception of the lug E, is made considerably wider than the thickness of the said lug, to admit oi' adjusting the two tools along the shank of tool C, so that one may be used without the other; for instance, if the eouutersink A is to be used, the tool B will be raised relatively to the other till the lug Il will come against the wall of bridge D at the' upper end of space K; but ii` the remuer is to be used, then the lug will be .brought against or near to the iower wall of the saidspace.

The points of the tools AB maybe of any forni best calculated for the work required of them.

In this instance the countersink is provided with the oblique concave bit, shown at L, and the rcznner has a vertical lip, M, at the outer corner of a horizontal cut-ter, N., as shown at figs. l and 4.

Having thus described my invention,

I claim as new and desire to secure by Letters Patent- The apertured lng E, having threaded shank H, and the slotted bridge 1), combined as described, with a thumb-uut, I, to fasten the counter B and reainer A to the boring-bit, so that either tool will come into action according as the lug E is at the upper or lower side ofthe bridge D.

FRANK H. PALMER.

Witnesses AUGUs'rUs G. Lnnnonn, HORACE F. GRANT. 

